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token-integration-analyzer — Claude Code skill

Checks ERC20 and ERC721 implementations plus code that integrates external tokens. Use it before accepting tokens with non-standard transfer or approval behaviour.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add trailofbits/skills --skill token-integration-analyzer -a claude-code
Open on GitHub

What token-integration-analyzer does

This skill reviews ERC20 or ERC721 implementations and protocol code that interacts with external tokens. It checks standards conformance, contract composition and owner powers, then looks for more than 20 unusual token behaviours such as transfer fees, rebasing, blocklists and missing return values.

For Solidity projects, it can guide runs of slither-check-erc, slither --print human-summary, slither --print contract-summary and slither-prop. With a deployed contract address, it also examines supply, holder distribution, exchange listings and on-chain configuration. That makes Slither command availability worth checking in your environment.

What it helps with

  • check ERC20 conformance
  • detect transfer fees and rebasing
  • assess contract owner powers
  • find handling of missing return values
  • inspect token supply and holder distribution

Example prompts for the agent

  • Review the ERC20 implementation in `contracts/Token.sol` for non-standard behaviour.
  • Assess how this protocol handles tokens that charge transfer fees.
  • Check the contract address I provide for blocklists and owner powers.

How to install token-integration-analyzer

1Skills CLI (Vercel)

npx skills add trailofbits/skills --skill token-integration-analyzer -a claude-code

2Manually: put the files in place

~/.claude/skills/token-integration-analyzer/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/token-integration-analyzer/

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Questions about token-integration-analyzer

How do I install token-integration-analyzer in Claude Code?

Run npx skills add trailofbits/skills --skill token-integration-analyzer -a claude-code, then run npx skills add trailofbits/skills --skill token-integration-analyzer -a claude-code again. The skill file is at ~/.claude/skills/token-integration-analyzer/SKILL.md.

What does token-integration-analyzer do?

It reviews ERC20 and ERC721 implementations, external token integrations, owner powers and known unusual token patterns. For deployed contracts, it can also examine on-chain data.

When is a contract address needed?

A contract address enables the on-chain portion of the review, including supply, holder distribution, exchange listings and contract configuration.

See also

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